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Wax Bleed

Stains, commonly mistaken for mildew, that come from waxy substances in the reconstituted wood products used to make hardboard siding. However, wax bleed areas bead water and mildew does not. When the substrate is painted, these staining substances bleed through the paint. They can even bleed through some ordinary primers, possibly causing dirt pickup, mildew and/or poor paint adhesion (see dirt pickup and mildew).

Possible Cause:
Failure to apply a proper primer to hardboard before applying the top coat.
Allowing hardboard siding to weather before being painted.

Solution:
To treat or prevent, apply a coat of quality oil-based primer followed by a coat of latex house paint.
The American Hardboard Association recommends two coats of top coat for best results.
All hardboard siding even factory pre-primed should be treated with an oil primer before top coating is applied.

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